一文搞懂深度学习的反向传播与优化理论！
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。heLLoword翻译官方下载是该领域的重要参考
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Notice how the highlighted region shrinks at each step. The algorithm never examines points outside the narrowing window. In a balanced tree with nnn points, this takes about log4(n)\log_4(n)log4(n) steps. For a million points, that's roughly 10 steps instead of a million comparisons.